<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Fernández-Santos, B</style></author><author><style face="normal" font="default" size="100%">Gomez Gutiérrez, J M</style></author><author><style face="normal" font="default" size="100%">Garcia Mares, R T</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">de la quema, corte, arranque, abandono o pastoreo del matorral de escoba blanca (Cytisus multiflorus) sobre la producción y estructura de la comunidad herbácea</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Biomass production</style></keyword><keyword><style  face="normal" font="default" size="100%">Community structure</style></keyword><keyword><style  face="normal" font="default" size="100%">Human disturbances treatments</style></keyword><keyword><style  face="normal" font="default" size="100%">Matorral pasture</style></keyword><keyword><style  face="normal" font="default" size="100%">Salamanca</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1992</style></year></dates><volume><style face="normal" font="default" size="100%">32</style></volume><pages><style face="normal" font="default" size="100%">131-146</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The effects of burning, cutting , pulling out, field abandonment or grazing on the pro- duction and structure of a dehesa pasture invaded by Cytisus multiflorus were studied. Significant differences in the biomass of herbaceous species were found between pastu- res and treatments when cutting was done in February. The highest total biomass pro- duction was in the &quot;abandoned&quot; plot. No differences were found between the burned and cut plots. All the treatments, except abandonment, gave rise to higher biomass in herbaceous plants compared to control plots, i.e. on which grazing was continued. After 3 years there was no effect of treatment on the appearance of new species. A decrease in species number was observed with the burned plot being the least affected. The área with traditional grazing showed the highest diversity, specific heterogeneity and propor- tion of leguminous species. The negative effect of cutting the above-ground biomass in winter is discussed. Key</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Gomez Gutiérrez, J M</style></author><author><style face="normal" font="default" size="100%">BARRERA MELLADO, I</style></author><author><style face="normal" font="default" size="100%">FERNÁNDEZ SANTOS, B</style></author><author><style face="normal" font="default" size="100%">Guti, M E Z</style></author><author><style face="normal" font="default" size="100%">Mellado, Barrera</style></author><author><style face="normal" font="default" size="100%">Santos, Ndez</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Fitomasa subterránea en pastizales semiáridos de dehesa. Estudio comparativo de cuatro transecciones</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">fitomasa subterránea</style></keyword><keyword><style  face="normal" font="default" size="100%">Grasslands</style></keyword><keyword><style  face="normal" font="default" size="100%">pastizales</style></keyword><keyword><style  face="normal" font="default" size="100%">raíces</style></keyword><keyword><style  face="normal" font="default" size="100%">roots</style></keyword><keyword><style  face="normal" font="default" size="100%">vaguada</style></keyword><keyword><style  face="normal" font="default" size="100%">water course</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1988</style></year></dates><volume><style face="normal" font="default" size="100%">19</style></volume><pages><style face="normal" font="default" size="100%">95-107</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">A comparative study of the underground phytomass (roots) valúes obtained along four transverse sections of four water courses was made in some semiarid grasslands, that are representative of the Central- Western área of Spain (Provinces of Avila and Salamanca). In order to perform this study, the following item's were studied: a) the total phyto- mass valúes for each profile (30 cm depth, 9 cm diameter), b) the hori- zons or 5 cm horizontal transect, in each section, c) the samples in each profile. Very similar sequences were observed in all the transects, high- lighting the effect of relief on underground phytomass, wich is considered a synthesis and an expression of the edaphicclimatic and anthropozoogenic action that governs its development. Key</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Escudero  Berian, A</style></author><author><style face="normal" font="default" size="100%">Montalvo  Hernândez, M I</style></author><author><style face="normal" font="default" size="100%">GARCÍA CRIADO, B</style></author><author><style face="normal" font="default" size="100%">Gomez Gutiérrez, J M</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Estudio comparativo de la movilización de bioelementos por los subsistemas arbóreo y herbáceo del ecosistema de Dehesa</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1983</style></year></dates><volume><style face="normal" font="default" size="100%">13</style></volume><pages><style face="normal" font="default" size="100%">9-20</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The quantity of various elements such as N, P, K, Ca, Mg, Na, Fe, Cu, Mn and Zn, mobilized annually by the two phytocoenotic components of the «dehesa» ecosystem has been evaluated from the data collected over two consecutive years. For this purpose, zones dominated by Oaks (Quer- cus rotundifolia Lam. and Q. pyrenaica Willd.) were selected, and, based on the annual nutrient input of the soil throug leaf litter and other re- sidues, the quantity of minerals removed was estimated. In the same lo&lt; cations, nutrients removed from pastures were also estimated in áreas with and without tree cover. From the results obtained, comparisons have been made between the two phytocoenotic components of the «dehesa». Conclusions have been formulated regarding the recycling tendencie exhibited by each nutrient element, based on the results obtained from internutrient comparisons. The role of tree cover in regulating the rate of nutrient cycling and conservation of nutrient reserves in the ecosystem, has also been eva- luated. 20</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Gomez Gutiérrez, J M</style></author><author><style face="normal" font="default" size="100%">Puerto Martín, A</style></author><author><style face="normal" font="default" size="100%">Calabuig, E L</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Distribución de la vegetación en una ladera sometida a riego temporal</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">aridez (voyant)</style></keyword><keyword><style  face="normal" font="default" size="100%">disponibilidad hídrica</style></keyword><keyword><style  face="normal" font="default" size="100%">encharcamiento</style></keyword><keyword><style  face="normal" font="default" size="100%">ladera</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1976</style></year></dates><volume><style face="normal" font="default" size="100%">6</style></volume><pages><style face="normal" font="default" size="100%">278-295</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">A quantitative analysis of the vegetation on a slope of a &quot;dehesa&quot; of Salamanca pro- vince has been made for the purposes of observing the effects of temporal irrigation. The 17 samples takings that were made included the presence of a total of 102 species whose abundance was studied by means of the analysis of correspondances. The first 3 components, which cover 47,21 % of the variance, are deduced and are interpreted from the analysis; the first as reflecting the access to water, the second as representative of the retention of water. The third seems to be related to the similarity between samplings. In the plañe defined by the first and second components, three zones became apparent; these were identified as swamping, aridity and an intermediate zone between these two. This intermediate zone is formed in the vértex of the directions of the other two which may be schematically represented as two linear trajectories which have the form of lines regres- sion and of which the coefficient of correlation are significantly different of zero. PASTOS</style></abstract></record></records></xml>